JP2008080542A - Painted construction board and method for judging its painted state - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a painted construction board which can detect a nozzle head of poor ejection easily and quickly, and can prevent frequent occurrence of poor color painting. <P>SOLUTION: An engaging piece 2 is provided at one edge of a substrate 1, a receptacle piece 3 engaging with the back side of the engaging piece 2 of other substrate 1 when the substrates 1 are connected is projected from the other edge of the substrate 1, and then the substrate 1 is passed through an inkjet printer ejecting ink in a plurality of colors from different nozzle heads thus obtaining a painted construction board where the surface of the substrate 1 is painted with ink in a plurality of colors ejected from respective nozzle heads. Simultaneously with color painting, a surface of the receptacle piece 3 is painted with ink ejected from respective nozzle heads and a mark 5 for confirming painted state is formed for each color. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a painted building board that has been color-coated with an ink jet printer, and a method for determining the state of color-coating.

  A painted building board used as an exterior material or the like is produced by painting the surface of a ceramic substrate or the like. In general, the substrate is coated by applying a paint using a spray coater, a roll coater coater, a flow coater coater, or the like. However, with such sprays, roll coats, flow coats, etc., it is difficult to paint a complicated pattern, and it is particularly difficult to coat a substrate having irregular irregularities such as an exterior material. On the other hand, painting is also performed using printing rolls such as letterpress and intaglio, but in this case, the same pattern is repeatedly applied, which tends to be a monotonous pattern and the pattern to be painted. When changing the above, it is necessary to replace the printing roll, and it is not possible to paint a different pattern for each substrate.

  Therefore, recently, it has been proposed that the surface of a substrate is coated by inkjet printing by ejecting ink from a nozzle head of the inkjet printer while feeding the substrate while using the inkjet printer as a coating machine (for example, Patent Document 1). Etc.).

  Inkjet printers are inks that are ejected from the nozzle head, and can be printed on the surface of the substrate in a non-contact manner, and can be applied by controlling the ejection of ink from the nozzle head. Ink can be ejected so that an arbitrary pattern is formed at an arbitrary position, and even a substrate having an uneven surface can be printed with a complicated pattern and applied. .

  Here, when color-coating the surface of the substrate 1, an ink jet printer 13 as shown in FIG. 2 is used. Although the detailed configuration of the ink jet printer 13 will be described later, the ink jet printer 13 includes a nozzle head 9 and an ink supply tank 11 that supplies ink to the nozzle head 9, and a feed conveyor 14 is disposed below the nozzle head 9. The nozzle head 9 is formed of four types of nozzle heads 9y, 9c, 9m, and 9k that eject inks of yellow, cyan, magenta, and black, and each of the nozzle heads 9y, 9c, 9m, and 9k is a feed conveyor 14. Are arranged in a line along.

And the board | substrate 1 is sent with the feed conveyor 14, and it passes under nozzle head 9y, 9c, 9m, 9k in order, and each injection of each nozzle head 9y, 9c, 9m, 9k is controlled by a control system at this time The substrate 1 can be coated by ejecting ink from the nozzle 10 and applying ink dots of yellow, cyan, magenta, and black to the surface of the substrate 1. In this way, a plurality of color ink dots ejected from the plurality of nozzle heads 9y, 9c, 9m, and 9k are gathered in a matrix, and a color visually recognized as a mixed color of the gathered colors can be developed. Any color can be developed by changing the density and arrangement of the dots of each color, and color coating can be performed.
JP 2005-74666 A

  As described above, color coating is performed by ejecting ink of each color of yellow, cyan, magenta, and black from the nozzle heads 9y, 9c, 9m, and 9k of the ink jet printer 13 to be applied to the surface of the substrate 1. However, if ink clogging occurs in some of the nozzle heads 9y, 9c, 9m, and 9k and ink ejection failure occurs, some colors of ink are not ejected or the ejection amount is insufficient. As a result, color coating cannot be performed with the designed normal coating color, resulting in poor coating.

  Since color coating is performed with a mixed color in which dots of a plurality of colors of ink are gathered in a matrix, any color of ink becomes poorly ejected even when the state of the color coating applied to the substrate 1 is seen. It is difficult to judge by visual confirmation. In particular, if the ejection of some ink does not stop completely, but the ink ejection is poor and the ejection amount is small, the color coating is in a poor state and any color ink has an ejection failure. It is difficult to determine whether you are doing it. Also, since the coating line installed indoors is generally dark, when the color coating failure state is delicate, even if the color coating state applied to the substrate 1 is visually inspected, the color coating failure is overlooked. In this case, painting may be continued as it is, and color painting defects may occur frequently.

  The present invention has been made in view of the above points, and it is possible to easily and quickly detect which color of ink is ejected from a nozzle head, and color coating defects frequently occur. It aims at providing the coating state judgment method of the painted building board which can prevent doing, and a painted building board.

  The painted building board according to claim 1 of the present invention is provided with the engagement piece 2 at one end edge of the substrate 1 and is engaged with the back side of the engagement piece 2 of the other substrate 1 when the substrates 1 are connected to each other. The receiving engagement piece 3 is projected from the other edge of the substrate 1 and the substrate 1 is passed through an ink jet printer 13 that ejects ink of a plurality of colors from different nozzle beds 9 for each color, whereby each nozzle A painted building board in which the surface of the substrate 1 is color-coated with a plurality of colors of ink ejected from the head 9, and is simultaneously ejected from each nozzle head 9 onto the surface of the receiving engagement piece 3. Ink is individually coated, and a coating state confirmation mark 5 is formed for each color.

  The coating state confirmation mark 5 for each color is formed in a single color by the application of ink ejected from each nozzle head 9. By visually observing the coating state confirmation mark 5 for each color, It is possible to easily and quickly detect whether or not ejection failure has occurred in the nozzle head 9 that ejects ink, and it is possible to quickly detect the occurrence of color coating failure and cause frequent color coating failures. It can be prevented. Moreover, the receiving engagement piece 3 is hidden behind the engagement piece 2 of the other substrate 1 when the substrates 1 are connected to each other when the painted building board is applied to the outer wall of the house. The appearance confirmation mark 5 applied to the piece 3 does not impair the appearance.

  The invention of claim 2 is characterized in that, in claim 1, the coating state confirmation mark 5 of each color is formed by changing the density of the ink color to provide a shade.

  By providing the coating state confirmation mark 5 with light and shade, it is possible to easily determine ink ejection failure when visually observing the coating state confirmation mark 5 formed in a single color.

  The invention of claim 3 is characterized in that, in claim 2, the boundary where the color density changes is partitioned by the partition line 6.

  By dividing the boundary where the density of light and shade changes in the coating state confirmation mark 5 by the partition line 6, the difference in density becomes clear, and it is possible to more easily determine ink ejection failure.

  According to a fourth aspect of the present invention, there is provided a method for determining a painted state of a painted building board, wherein the surface of the substrate 1 is color-coated with an ink jet printer 13 to produce the painted building board according to any one of claims 1 to 3. In doing so, the quality of the ejected state of the ink from each nozzle head 13 is determined on the basis of the coating state confirmation mark 5 painted on the receiving engagement piece 3.

  By visually observing the paint state confirmation mark 5 for each color, it is possible to easily and quickly determine which color of ink is ejected from the nozzle head 9 that ejects the ink. It is possible to prevent frequent painting defects.

  According to the present invention, the paint state confirmation mark 5 for each color is formed in a single color by painting the ink ejected from each nozzle head 9, so that by visually observing the paint state confirmation mark 5 for each color It is possible to easily and quickly detect which color of ink is ejected from the nozzle head 9 that ejects ink, and the occurrence of color painting defects can be quickly detected to cause frequent color painting defects. In addition, the receiving engagement piece 3 is hidden by the engagement piece 2 of another substrate 1 when connecting the substrates 1 to each other when constructing a painted building board on the outer wall of a house. In other words, the coating state confirmation mark 5 painted on the receiving engagement piece 3 does not impair the appearance.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The substrate 1 is formed, for example, as a ceramic-based rectangular plate, and the engagement piece 2 is integrated at one side end on the longitudinal side, and the receiving engagement piece 3 is integrated at the other side end over the entire length. Projected to When a painted building board produced from this board 1 is attached to a base 8 such as an outer wall of a house as an outer wall material or the like, a plurality of boards 1 are connected side by side in the vertical or horizontal direction. As shown in FIG. The engaging piece 2 of the other substrate 1 is engaged with the front side of the receiving engagement piece 3 of the mating substrate 1 so that the connection engagement piece 3 is engaged with the other substrate 1. It is a portion that is hidden behind the composite piece 2 and is not exposed to the outside.

  Next, a method for color-painting a pattern on the surface of the substrate 1 with the ink jet printer 13 will be described. The ink jet printer 13 is formed of a nozzle head 9, an ink supply tank 11 that supplies ink to the nozzle head 9, a print control system 12 that controls ejection of ink from the nozzle head 9, and the like, as schematically shown in FIG. The inkjet printer 13 is disposed above the feed conveyor 14 that feeds the substrate 1 in a horizontal posture.

  The nozzle head 9 is provided at the lower end of the ink jet printer 13 and is formed as a long line head in a direction perpendicular to the feeding direction of the building board 1. A large number of spray nozzles 10 are provided on the lower surface of the nozzle head 9 along the longitudinal direction of the nozzle head 9 so that coating can be performed with high density dpi. The nozzle head 9 is formed of four types of nozzle heads 9y, 9c, 9m, and 9k that eject inks of yellow, cyan, magenta, and black, and can perform color coating by full-color printing. . Similarly, the ink supply tank 11 is composed of four types. The ink supply tank 11y for supplying yellow ink is supplied to the nozzle head 9y, the ink supply tank 11c for supplying cyan ink is supplied to the nozzle head 9c, and magenta. The ink supply tank 11m for supplying the black ink is connected to the nozzle head 9m, and the ink supply tank 11k for supplying the black ink is connected to the nozzle head 9k. The nozzle heads 9y, 9c, 9m, and 9k are arranged along the feeding direction of the substrate 1.

  The print control system 12 includes various CPUs, ROMs, RAMs, and the like, and includes a print data creation unit, a print control unit, an ejection nozzle control unit, and the like. The print data creation unit inputs and stores the pattern pattern data obtained by scanning the original image with a scanner or the like. The print control unit prints the pattern pattern data corresponding to the substrate 1 to be coated with the print data. A control signal is output from the creation unit to the spray nozzle control unit based on the pattern data. The injection nozzle control unit is connected to the injection nozzles 10 of the nozzle heads 9y, 9c, 9m, and 9k, and controls each injection nozzle 10 based on a control signal input from the injection nozzle control unit. Each of the ejection nozzles 10 is controlled to be ejected by, for example, a piezo control system, and the ejection nozzle control unit controls each ejection nozzle 10 to eject and stop yellow, cyan, magenta, and black inks. Can be individually controlled to perform color coating of a pattern by full-color printing corresponding to the pattern.

  Then, the substrate 1 is sent by the feed conveyor 14 and passed under the nozzle heads 9y, 9c, 9m, 9k in this order. At this time, the nozzle heads 9y, 9c, 9m are controlled by the print control system 12 as described above. , 9k, the ink is ejected from each of the ejection nozzles 10 and applied to the surface of the substrate 1, whereby the substrate 1 can be painted with a patterned pattern. Here, ink is ejected from the ejection nozzles 10 of the nozzle heads 9y, 9c, 9m, and 9k. The leading edge in the feed direction of the substrate 1 is the ejection nozzles 10 of the nozzle heads 9y, 9c, 9m, and 9k. It is necessary to match the timing of injection with the feed of the substrate 1 so that it starts on the basis of when it reaches just below, for example, the detection of the arrival of the substrate 1 by a sensor or the like, and detection by this sensor When the signal is input to the ejection nozzle control unit of the print control system 12, the ejection of ink from the ejection nozzles 10 of the nozzle heads 9y, 9c, 9m, and 9k is started a predetermined time after the detection signal is input. In this way, the injection timing is matched with the feeding of the substrate 1.

  As described above, when color-coating the surface of the substrate 1 with the ink jet printer 13, at the same time, as shown in FIGS. 1A and 1B, the coating state confirmation mark 5 is provided on the receiving engagement piece 3 of the substrate 1. It is designed to be painted. The substrate 1 is sent to the ink jet printer 13 by the feed conveyor 14 with the edge perpendicular to the edge provided with the receiving engagement piece 3 as the head, and ejects ink from each nozzle head 9y, 9c, 9m, 9k. Thus, when color coating is performed on the surface of the substrate 1, the coating state confirmation mark 5 can be coated with ink ejected from the nozzle heads 9y, 9c, 9m, and 9k in parallel. The coating state confirmation mark 5 is applied to the surface of the engagement piece 3 by individually receiving the ink of each color ejected from each nozzle head 9y, 9c, 9m, 9k provided in the ink jet printer 13 and thereby applying each color. It is formed independently for each ink. For example, when the nozzle head 9 is formed of four types of nozzle heads 9y, 9c, 9m, and 9k that eject inks of yellow, cyan, magenta, and black, as described above, the yellow that is ejected from the nozzle head 9y. The coating state confirmation mark 5y is made of the ink of the ink, the coating state confirmation mark 5c is made of the cyan ink ejected from the nozzle head 9c, and the coating state confirmation mark 5m is made of the magenta ink ejected from the nozzle head 9m. The coating state confirmation mark 5k is formed with black ink ejected from the head 9k.

  Here, the ink pattern is satisfactorily ejected from all the nozzle heads 9y, 9c, 9m, and 9k of the ink jet printer 13, so that the design pattern as designed on the surface of the substrate 1 can be color-coated. At this time, since the coating state confirmation marks 5y, 5c, 5m, and 5k formed on the receiving engagement piece 3 are coated with ink that is well ejected from the nozzle heads 9y, 9c, 9m, and 9k, All the coating state confirmation marks 5y, 5c, 5m, and 5k are formed with the same uniform density. Accordingly, the coating state confirmation marks 5y, 5c, 5m, 5k painted on the receiving engagement piece 3 are visually observed, and all the coating state confirmation marks 5y, 5c, 5m, 5k are formed with the same uniform density. If it is confirmed that the ink is ejected from all the nozzle heads 9y, 9c, 9m, and 9k, it can be determined that the color coating state is good. it can.

  On the other hand, among the nozzle heads 9y, 9c, 9m, and 9k provided in the ink jet printer 13, it was designed when ink ejection failure occurred in some of the nozzle heads 9y, 9c, 9m, and 9k due to ink clogging. The pattern pattern cannot be painted in color, resulting in poor painting. At this time, of the coating state confirmation marks 5y, 5c, 5m, and 5k formed on the receiving engagement piece 3, the coating is performed with the ink ejected from the nozzle heads 9y, 9c, 9m, and 9k in the normal ejection state. The coating state confirmation marks 5y, 5c, 5m, and 5k are formed with the same uniform density, but are coated with ink ejected from the nozzle heads 9y, 9c, 9m, and 9k in which ejection failure has occurred. The coating state confirmation marks 5y, 5c, 5m, and 5k are not formed or have a lighter density than those of the others. For example, the ejection state of the nozzle heads 9c, 9m, and 9k is normal, but when the ejection failure occurs in the nozzle head 9y, the coating state confirmation marks 5c, 5m, and 5k are formed with the same uniform density. When no ink is ejected from the head 9y, the coating state confirmation mark 5y is not formed, and when the amount of ink ejected from the nozzle head 9y is small, the coating state confirmation mark 5y has a faint density.

  Here, since each of the coating state confirmation marks 5y, 5c, 5m, and 5k is formed of a single color ink, when the coating state confirmation mark 5y is not formed, of course, the density of the coating state confirmation mark 5y. Even if it is thin, the difference in density from the other paint state confirmation marks 5c, 5m, 5k can be easily distinguished, and the paint state confirmation marks 5y, 5c, 5m, 5k should be visually observed. This makes it possible to intuitively determine that there is an abnormality in the paint state of the paint state confirmation mark 5y. Accordingly, when the coating state confirmation marks 5y, 5c, 5m, and 5k are visually observed and it is determined that the coating state confirmation mark 5y is abnormal, it is easy to indicate that the nozzle head 9y has an ink ejection defect. In addition, it is possible to quickly and quickly determine that a color coating defect has occurred without inspecting the state of the color coating applied to the surface of the substrate 1. It is something that can be done. Therefore, at this time, by immediately stopping the coating by the ink jet printer 13, it is possible to prevent the occurrence of a subsequent coating failure, and any nozzle head 9y, 9c, 9m, 9k has an ink ejection failure. Therefore, it is possible to quickly resume painting by replacing or repairing the nozzle heads 9y, 9c, 9m, and 9k where the ink ejection failure has occurred.

  In the embodiment shown in FIG. 1, the coating state confirmation mark 5 is connected to the longitudinal direction of the receiving engagement piece 3 at the end of the receiving engagement piece 3 on the front end side in the feed direction of the substrate 1 to the ink jet printer 13. It is formed as a short straight line that is parallel and separated.

  The mode of the coating state confirmation mark 5 provided on the receiving engagement piece 3 is not limited to that shown in FIG. 1, and can be formed in various modes. For example, FIG. 3A is formed as a separated straight line perpendicular to the longitudinal direction of the receiving engagement piece 3. 3 (b) and 3 (c), the coating state confirmation mark 5 is formed in close contact with a belt, and FIG. 3 (b) is parallel to the longitudinal direction of the receiving engagement piece 3, and FIG. (C) is formed perpendicularly to the longitudinal direction of the receiving engagement piece 3. Further, in FIG. 3D, the coating state confirmation mark 5 is formed in a round shape, and the shape may be formed in an arbitrary shape such as a triangular shape or a square shape in addition to such a round shape. It is also possible to form the paint state confirmation mark 5 with letters such as alphabets, numbers, symbols, or the like.

  In the embodiment shown in FIGS. 1 and 3, the coating state confirmation mark 5 is provided at one place on the end of the receiving engagement piece 3. However, the coating state confirmation mark 5 may be provided at any position. In addition, the coating state confirmation marks 5 may be provided at both ends and the center in the longitudinal direction of the receiving engagement piece 3 as shown in FIG. Thus, if the coating state confirmation marks 5 are provided at a plurality of locations in the longitudinal direction of the receiving engagement piece 3, that is, a plurality of locations along the direction in which the substrate 1 is fed to the ink jet printer 13, the coating state confirmation marks 5 are provided. It is possible to determine the state of color coating applied to the substrate 1 at each position provided with.

  Further, the coating state confirmation mark 5 may be provided on the entire length in the longitudinal direction of the receiving engagement piece 3 as shown in FIG. In FIG. 5A, the coating state confirmation mark 5 is formed as a straight line, in FIG. 5B, the coating state confirmation mark 5 is formed as a dotted line, and in FIG. 5C, the coating state confirmation mark 5 is formed as a chain line. However, the coating state confirmation mark 5 can be formed in any other shape. Thus, if the coating state confirmation mark 5 is provided along the entire length in the longitudinal direction of the receiving engagement piece 3, that is, the entire length in the direction in which the substrate 1 is fed to the ink jet printer 13, the substrate 1 has the entire length of the substrate 1. There is one that can determine the state of the color coating applied to.

  FIG. 6 shows another embodiment of the present invention, in which yellow, cyan, magenta, black, and coating confirmation marks 5y, 5c, 5m, and 5k are ejected from the nozzle heads 9y, 9c, 9m, and 9k. When the ink is coated with each color ink and formed into a strip shape, the density of the color is changed by changing the dot density of the ink, and each of the coating confirmation marks 5y, 5c, 5m, 5k It is formed to consist of a plurality of thin portions.

  In the embodiment shown in FIG. 6A, a high density region H having the highest color density, a low density region L having a low color density, and a middle density region M having an intermediate color density are formed. The coating confirmation marks 5y, 5c, 5m, and 5k are formed in the order of the high density area H, the medium density area M, and the low density area L from the high density area to the low density area. is there. For example, the high concentration portion H can be formed with a concentration of 100%, the medium concentration portion M with a concentration of 70 to 40%, and the low concentration region L with a concentration of 30 to 10%. In addition, each of the coating confirmation marks 5y, 5c, 5m, and 5k is configured such that regions having the same density are adjacent to each other so as to be close to each other, and a gap is formed between the regions having different densities. Of course, the number of density steps and the degree of density change are not limited to these, and can be arbitrarily set, and the density change is not stepwise as described above and is continuous. You may make it change gradually.

  In this way, the coating confirmation marks 5y, 5c, 5m, and 5k are formed by providing shades of colors, so that when the coating confirmation marks 5y, 5c, 5m, and 5k are visually inspected, the regions having the same density are used. Visual inspection can be performed by comparing the coating confirmation marks 5y, 5c, 5m, and 5k in a plurality of stages, for example, in three stages of high density areas H, medium density areas M, and low density areas L. If any of the coating state confirmation marks 5y, 5c, 5m, and 5k is abnormal in coating state, it can be easily determined, and the ink ejection of the nozzle heads 9y, 9c, 9m, and 9k is possible. A defect can be easily found. In particular, when a defect occurs in which the amount of ink ejected from the nozzle heads 9y, 9c, 9m, and 9k is insufficient, coating is not performed in a low-density region such as the low-density region L, and ink ejection failure occurs. It can be discovered more easily.

  In the embodiment of FIG. 6B, partition lines 6 are provided and partitioned between the coating confirmation marks 5y, 5c, 5m, and 5k, and at boundaries where the density changes. In the illustrated embodiment, the high concentration region H, medium concentration region M, and low concentration region L of each of the coating confirmation marks 5y, 5c, 5m, and 5k are surrounded by a partition line 6 so as to partition them. The partition line 6 is preferably formed in a dark color, for example, black ink ejected from the nozzle head 9k, cyan ink ejected from the nozzle head 9c, or ejected from the nozzle heads 9y, 9c, 9m, 9k. It can be formed with a mixed black ink in which yellow, cyan, magenta, and black inks are mixed. The other configuration is the same as that of FIG.

  When areas with different densities are adjacent to each other in the coating confirmation marks 5y, 5c, 5m, and 5k as in the embodiment of FIG. 6A, the density depends on the brightness of the work environment and the viewpoint of visual inspection. In some cases, it is difficult to determine the difference in difference between different areas, and in particular, it may be difficult to determine the difference in density change for magenta and yellow single colors. The regions (high concentration region H, medium concentration region M, and low concentration region L) can be visually recognized in a mutually independent state, and the difference between the regions having different concentrations can be easily discriminated.

  Here, as in each of the above-described embodiments, the coating state confirmation mark 5 is applied to the receiving engagement piece 3, but as shown in FIG. When a painted building board is attached to a base 8 such as an outer wall of a house as an outer wall material, the engaging piece 2 of the other board 1 is engaged with the front side of the receiving and engaging piece 3 of one adjacent board 1. Therefore, the receiving engagement piece 3 is a portion that is hidden behind the engagement piece 2 of the other substrate 1 and is not exposed to the outside. Therefore, the coating state confirmation mark 5 painted on the receiving engagement piece 3 is not exposed to the outside in the construction state, and the coating state confirmation mark 5 does not impair the appearance.

An example of embodiment of the painted building board which concerns on this invention is shown, (a) is a front view, (b) is a partially expanded front view. It is the schematic which shows the coating by an inkjet printer same as the above. The other example of embodiment of the same painted building board is shown, (a) thru | or (d) is a partially expanded front view, respectively. It is a front view which shows another example of embodiment of the same painted building board. The other example of embodiment of the same painted building board is shown, (a) thru | or (c) is a partially expanded front view, respectively. The other example of embodiment of the same painted building board is shown, (a) and (b) are some enlarged front views, respectively. It is sectional drawing which shows the construction state of a painted building board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Engagement piece 3 Receiving engagement piece 5 Paint state confirmation mark 6 Partition line

Claims (4)

  An engagement piece is provided on one edge of the substrate, and a receiving engagement piece that is engaged with the back side of the engagement piece of the other substrate when the substrates are connected to each other protrudes from the other edge of the substrate. A painted building board in which the surface of the substrate is painted with multiple colors of ink ejected from each nozzle head by passing the substrate through an ink jet printer that ejects different types of ink from different nozzle beds for each color The coating is characterized in that the ink ejected from each nozzle head is individually coated on the surface of the receiving engagement piece at the same time as this color coating, and a paint state confirmation mark is formed for each color. Architectural board.   The painted building board according to claim 1, wherein the paint state confirmation mark for each color is formed by changing the density of the color to provide a shade.   3. The painted building board according to claim 2, wherein the boundary where the color density changes is partitioned by a partition line.   When manufacturing the painted building board according to any one of claims 1 to 3 by color-coating the surface of the substrate with an inkjet printer, A method for determining a coating state of a painted building board, comprising: determining whether the ejection state of ink from a nozzle head is good or bad.

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